--- /dev/null
+/*
+ * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * Implementation of RFC 3779 section 2.2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "internal/cryptlib.h"
+#include <openssl/conf.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/buffer.h>
+#include <openssl/x509v3.h>
+#include "crypto/x509.h"
+#include "ext_dat.h"
+
+#ifndef OPENSSL_NO_RFC3779
+
+/*
+ * OpenSSL ASN.1 template translation of RFC 3779 2.2.3.
+ */
+
+ASN1_SEQUENCE(IPAddressRange) = {
+ ASN1_SIMPLE(IPAddressRange, min, ASN1_BIT_STRING),
+ ASN1_SIMPLE(IPAddressRange, max, ASN1_BIT_STRING)
+} ASN1_SEQUENCE_END(IPAddressRange)
+
+ASN1_CHOICE(IPAddressOrRange) = {
+ ASN1_SIMPLE(IPAddressOrRange, u.addressPrefix, ASN1_BIT_STRING),
+ ASN1_SIMPLE(IPAddressOrRange, u.addressRange, IPAddressRange)
+} ASN1_CHOICE_END(IPAddressOrRange)
+
+ASN1_CHOICE(IPAddressChoice) = {
+ ASN1_SIMPLE(IPAddressChoice, u.inherit, ASN1_NULL),
+ ASN1_SEQUENCE_OF(IPAddressChoice, u.addressesOrRanges, IPAddressOrRange)
+} ASN1_CHOICE_END(IPAddressChoice)
+
+ASN1_SEQUENCE(IPAddressFamily) = {
+ ASN1_SIMPLE(IPAddressFamily, addressFamily, ASN1_OCTET_STRING),
+ ASN1_SIMPLE(IPAddressFamily, ipAddressChoice, IPAddressChoice)
+} ASN1_SEQUENCE_END(IPAddressFamily)
+
+ASN1_ITEM_TEMPLATE(IPAddrBlocks) =
+ ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0,
+ IPAddrBlocks, IPAddressFamily)
+static_ASN1_ITEM_TEMPLATE_END(IPAddrBlocks)
+
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressRange)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressOrRange)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressChoice)
+IMPLEMENT_ASN1_FUNCTIONS(IPAddressFamily)
+
+/*
+ * How much buffer space do we need for a raw address?
+ */
+#define ADDR_RAW_BUF_LEN 16
+
+/*
+ * What's the address length associated with this AFI?
+ */
+static int length_from_afi(const unsigned afi)
+{
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ return 4;
+ case IANA_AFI_IPV6:
+ return 16;
+ default:
+ return 0;
+ }
+}
+
+/*
+ * Extract the AFI from an IPAddressFamily.
+ */
+unsigned int X509v3_addr_get_afi(const IPAddressFamily *f)
+{
+ if (f == NULL
+ || f->addressFamily == NULL
+ || f->addressFamily->data == NULL
+ || f->addressFamily->length < 2)
+ return 0;
+ return (f->addressFamily->data[0] << 8) | f->addressFamily->data[1];
+}
+
+/*
+ * Expand the bitstring form of an address into a raw byte array.
+ * At the moment this is coded for simplicity, not speed.
+ */
+static int addr_expand(unsigned char *addr,
+ const ASN1_BIT_STRING *bs,
+ const int length, const unsigned char fill)
+{
+ if (bs->length < 0 || bs->length > length)
+ return 0;
+ if (bs->length > 0) {
+ memcpy(addr, bs->data, bs->length);
+ if ((bs->flags & 7) != 0) {
+ unsigned char mask = 0xFF >> (8 - (bs->flags & 7));
+ if (fill == 0)
+ addr[bs->length - 1] &= ~mask;
+ else
+ addr[bs->length - 1] |= mask;
+ }
+ }
+ memset(addr + bs->length, fill, length - bs->length);
+ return 1;
+}
+
+/*
+ * Extract the prefix length from a bitstring.
+ */
+#define addr_prefixlen(bs) ((int) ((bs)->length * 8 - ((bs)->flags & 7)))
+
+/*
+ * i2r handler for one address bitstring.
+ */
+static int i2r_address(BIO *out,
+ const unsigned afi,
+ const unsigned char fill, const ASN1_BIT_STRING *bs)
+{
+ unsigned char addr[ADDR_RAW_BUF_LEN];
+ int i, n;
+
+ if (bs->length < 0)
+ return 0;
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ if (!addr_expand(addr, bs, 4, fill))
+ return 0;
+ BIO_printf(out, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+ break;
+ case IANA_AFI_IPV6:
+ if (!addr_expand(addr, bs, 16, fill))
+ return 0;
+ for (n = 16; n > 1 && addr[n - 1] == 0x00 && addr[n - 2] == 0x00;
+ n -= 2) ;
+ for (i = 0; i < n; i += 2)
+ BIO_printf(out, "%x%s", (addr[i] << 8) | addr[i + 1],
+ (i < 14 ? ":" : ""));
+ if (i < 16)
+ BIO_puts(out, ":");
+ if (i == 0)
+ BIO_puts(out, ":");
+ break;
+ default:
+ for (i = 0; i < bs->length; i++)
+ BIO_printf(out, "%s%02x", (i > 0 ? ":" : ""), bs->data[i]);
+ BIO_printf(out, "[%d]", (int)(bs->flags & 7));
+ break;
+ }
+ return 1;
+}
+
+/*
+ * i2r handler for a sequence of addresses and ranges.
+ */
+static int i2r_IPAddressOrRanges(BIO *out,
+ const int indent,
+ const IPAddressOrRanges *aors,
+ const unsigned afi)
+{
+ int i;
+ for (i = 0; i < sk_IPAddressOrRange_num(aors); i++) {
+ const IPAddressOrRange *aor = sk_IPAddressOrRange_value(aors, i);
+ BIO_printf(out, "%*s", indent, "");
+ switch (aor->type) {
+ case IPAddressOrRange_addressPrefix:
+ if (!i2r_address(out, afi, 0x00, aor->u.addressPrefix))
+ return 0;
+ BIO_printf(out, "/%d\n", addr_prefixlen(aor->u.addressPrefix));
+ continue;
+ case IPAddressOrRange_addressRange:
+ if (!i2r_address(out, afi, 0x00, aor->u.addressRange->min))
+ return 0;
+ BIO_puts(out, "-");
+ if (!i2r_address(out, afi, 0xFF, aor->u.addressRange->max))
+ return 0;
+ BIO_puts(out, "\n");
+ continue;
+ }
+ }
+ return 1;
+}
+
+/*
+ * i2r handler for an IPAddrBlocks extension.
+ */
+static int i2r_IPAddrBlocks(const X509V3_EXT_METHOD *method,
+ void *ext, BIO *out, int indent)
+{
+ const IPAddrBlocks *addr = ext;
+ int i;
+ for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+ IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+ const unsigned int afi = X509v3_addr_get_afi(f);
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ BIO_printf(out, "%*sIPv4", indent, "");
+ break;
+ case IANA_AFI_IPV6:
+ BIO_printf(out, "%*sIPv6", indent, "");
+ break;
+ default:
+ BIO_printf(out, "%*sUnknown AFI %u", indent, "", afi);
+ break;
+ }
+ if (f->addressFamily->length > 2) {
+ switch (f->addressFamily->data[2]) {
+ case 1:
+ BIO_puts(out, " (Unicast)");
+ break;
+ case 2:
+ BIO_puts(out, " (Multicast)");
+ break;
+ case 3:
+ BIO_puts(out, " (Unicast/Multicast)");
+ break;
+ case 4:
+ BIO_puts(out, " (MPLS)");
+ break;
+ case 64:
+ BIO_puts(out, " (Tunnel)");
+ break;
+ case 65:
+ BIO_puts(out, " (VPLS)");
+ break;
+ case 66:
+ BIO_puts(out, " (BGP MDT)");
+ break;
+ case 128:
+ BIO_puts(out, " (MPLS-labeled VPN)");
+ break;
+ default:
+ BIO_printf(out, " (Unknown SAFI %u)",
+ (unsigned)f->addressFamily->data[2]);
+ break;
+ }
+ }
+ switch (f->ipAddressChoice->type) {
+ case IPAddressChoice_inherit:
+ BIO_puts(out, ": inherit\n");
+ break;
+ case IPAddressChoice_addressesOrRanges:
+ BIO_puts(out, ":\n");
+ if (!i2r_IPAddressOrRanges(out,
+ indent + 2,
+ f->ipAddressChoice->
+ u.addressesOrRanges, afi))
+ return 0;
+ break;
+ }
+ }
+ return 1;
+}
+
+/*
+ * Sort comparison function for a sequence of IPAddressOrRange
+ * elements.
+ *
+ * There's no sane answer we can give if addr_expand() fails, and an
+ * assertion failure on externally supplied data is seriously uncool,
+ * so we just arbitrarily declare that if given invalid inputs this
+ * function returns -1. If this messes up your preferred sort order
+ * for garbage input, tough noogies.
+ */
+static int IPAddressOrRange_cmp(const IPAddressOrRange *a,
+ const IPAddressOrRange *b, const int length)
+{
+ unsigned char addr_a[ADDR_RAW_BUF_LEN], addr_b[ADDR_RAW_BUF_LEN];
+ int prefixlen_a = 0, prefixlen_b = 0;
+ int r;
+
+ switch (a->type) {
+ case IPAddressOrRange_addressPrefix:
+ if (!addr_expand(addr_a, a->u.addressPrefix, length, 0x00))
+ return -1;
+ prefixlen_a = addr_prefixlen(a->u.addressPrefix);
+ break;
+ case IPAddressOrRange_addressRange:
+ if (!addr_expand(addr_a, a->u.addressRange->min, length, 0x00))
+ return -1;
+ prefixlen_a = length * 8;
+ break;
+ }
+
+ switch (b->type) {
+ case IPAddressOrRange_addressPrefix:
+ if (!addr_expand(addr_b, b->u.addressPrefix, length, 0x00))
+ return -1;
+ prefixlen_b = addr_prefixlen(b->u.addressPrefix);
+ break;
+ case IPAddressOrRange_addressRange:
+ if (!addr_expand(addr_b, b->u.addressRange->min, length, 0x00))
+ return -1;
+ prefixlen_b = length * 8;
+ break;
+ }
+
+ if ((r = memcmp(addr_a, addr_b, length)) != 0)
+ return r;
+ else
+ return prefixlen_a - prefixlen_b;
+}
+
+/*
+ * IPv4-specific closure over IPAddressOrRange_cmp, since sk_sort()
+ * comparison routines are only allowed two arguments.
+ */
+static int v4IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
+ const IPAddressOrRange *const *b)
+{
+ return IPAddressOrRange_cmp(*a, *b, 4);
+}
+
+/*
+ * IPv6-specific closure over IPAddressOrRange_cmp, since sk_sort()
+ * comparison routines are only allowed two arguments.
+ */
+static int v6IPAddressOrRange_cmp(const IPAddressOrRange *const *a,
+ const IPAddressOrRange *const *b)
+{
+ return IPAddressOrRange_cmp(*a, *b, 16);
+}
+
+/*
+ * Calculate whether a range collapses to a prefix.
+ * See last paragraph of RFC 3779 2.2.3.7.
+ */
+static int range_should_be_prefix(const unsigned char *min,
+ const unsigned char *max, const int length)
+{
+ unsigned char mask;
+ int i, j;
+
+ if (memcmp(min, max, length) <= 0)
+ return -1;
+ for (i = 0; i < length && min[i] == max[i]; i++) ;
+ for (j = length - 1; j >= 0 && min[j] == 0x00 && max[j] == 0xFF; j--) ;
+ if (i < j)
+ return -1;
+ if (i > j)
+ return i * 8;
+ mask = min[i] ^ max[i];
+ switch (mask) {
+ case 0x01:
+ j = 7;
+ break;
+ case 0x03:
+ j = 6;
+ break;
+ case 0x07:
+ j = 5;
+ break;
+ case 0x0F:
+ j = 4;
+ break;
+ case 0x1F:
+ j = 3;
+ break;
+ case 0x3F:
+ j = 2;
+ break;
+ case 0x7F:
+ j = 1;
+ break;
+ default:
+ return -1;
+ }
+ if ((min[i] & mask) != 0 || (max[i] & mask) != mask)
+ return -1;
+ else
+ return i * 8 + j;
+}
+
+/*
+ * Construct a prefix.
+ */
+static int make_addressPrefix(IPAddressOrRange **result,
+ unsigned char *addr, const int prefixlen)
+{
+ int bytelen = (prefixlen + 7) / 8, bitlen = prefixlen % 8;
+ IPAddressOrRange *aor = IPAddressOrRange_new();
+
+ if (aor == NULL)
+ return 0;
+ aor->type = IPAddressOrRange_addressPrefix;
+ if (aor->u.addressPrefix == NULL &&
+ (aor->u.addressPrefix = ASN1_BIT_STRING_new()) == NULL)
+ goto err;
+ if (!ASN1_BIT_STRING_set(aor->u.addressPrefix, addr, bytelen))
+ goto err;
+ aor->u.addressPrefix->flags &= ~7;
+ aor->u.addressPrefix->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+ if (bitlen > 0) {
+ aor->u.addressPrefix->data[bytelen - 1] &= ~(0xFF >> bitlen);
+ aor->u.addressPrefix->flags |= 8 - bitlen;
+ }
+
+ *result = aor;
+ return 1;
+
+ err:
+ IPAddressOrRange_free(aor);
+ return 0;
+}
+
+/*
+ * Construct a range. If it can be expressed as a prefix,
+ * return a prefix instead. Doing this here simplifies
+ * the rest of the code considerably.
+ */
+static int make_addressRange(IPAddressOrRange **result,
+ unsigned char *min,
+ unsigned char *max, const int length)
+{
+ IPAddressOrRange *aor;
+ int i, prefixlen;
+
+ if ((prefixlen = range_should_be_prefix(min, max, length)) >= 0)
+ return make_addressPrefix(result, min, prefixlen);
+
+ if ((aor = IPAddressOrRange_new()) == NULL)
+ return 0;
+ aor->type = IPAddressOrRange_addressRange;
+ if ((aor->u.addressRange = IPAddressRange_new()) == NULL)
+ goto err;
+ if (aor->u.addressRange->min == NULL &&
+ (aor->u.addressRange->min = ASN1_BIT_STRING_new()) == NULL)
+ goto err;
+ if (aor->u.addressRange->max == NULL &&
+ (aor->u.addressRange->max = ASN1_BIT_STRING_new()) == NULL)
+ goto err;
+
+ for (i = length; i > 0 && min[i - 1] == 0x00; --i) ;
+ if (!ASN1_BIT_STRING_set(aor->u.addressRange->min, min, i))
+ goto err;
+ aor->u.addressRange->min->flags &= ~7;
+ aor->u.addressRange->min->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+ if (i > 0) {
+ unsigned char b = min[i - 1];
+ int j = 1;
+ while ((b & (0xFFU >> j)) != 0)
+ ++j;
+ aor->u.addressRange->min->flags |= 8 - j;
+ }
+
+ for (i = length; i > 0 && max[i - 1] == 0xFF; --i) ;
+ if (!ASN1_BIT_STRING_set(aor->u.addressRange->max, max, i))
+ goto err;
+ aor->u.addressRange->max->flags &= ~7;
+ aor->u.addressRange->max->flags |= ASN1_STRING_FLAG_BITS_LEFT;
+ if (i > 0) {
+ unsigned char b = max[i - 1];
+ int j = 1;
+ while ((b & (0xFFU >> j)) != (0xFFU >> j))
+ ++j;
+ aor->u.addressRange->max->flags |= 8 - j;
+ }
+
+ *result = aor;
+ return 1;
+
+ err:
+ IPAddressOrRange_free(aor);
+ return 0;
+}
+
+/*
+ * Construct a new address family or find an existing one.
+ */
+static IPAddressFamily *make_IPAddressFamily(IPAddrBlocks *addr,
+ const unsigned afi,
+ const unsigned *safi)
+{
+ IPAddressFamily *f;
+ unsigned char key[3];
+ int keylen;
+ int i;
+
+ key[0] = (afi >> 8) & 0xFF;
+ key[1] = afi & 0xFF;
+ if (safi != NULL) {
+ key[2] = *safi & 0xFF;
+ keylen = 3;
+ } else {
+ keylen = 2;
+ }
+
+ for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+ f = sk_IPAddressFamily_value(addr, i);
+ if (f->addressFamily->length == keylen &&
+ !memcmp(f->addressFamily->data, key, keylen))
+ return f;
+ }
+
+ if ((f = IPAddressFamily_new()) == NULL)
+ goto err;
+ if (f->ipAddressChoice == NULL &&
+ (f->ipAddressChoice = IPAddressChoice_new()) == NULL)
+ goto err;
+ if (f->addressFamily == NULL &&
+ (f->addressFamily = ASN1_OCTET_STRING_new()) == NULL)
+ goto err;
+ if (!ASN1_OCTET_STRING_set(f->addressFamily, key, keylen))
+ goto err;
+ if (!sk_IPAddressFamily_push(addr, f))
+ goto err;
+
+ return f;
+
+ err:
+ IPAddressFamily_free(f);
+ return NULL;
+}
+
+/*
+ * Add an inheritance element.
+ */
+int X509v3_addr_add_inherit(IPAddrBlocks *addr,
+ const unsigned afi, const unsigned *safi)
+{
+ IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
+ if (f == NULL ||
+ f->ipAddressChoice == NULL ||
+ (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
+ f->ipAddressChoice->u.addressesOrRanges != NULL))
+ return 0;
+ if (f->ipAddressChoice->type == IPAddressChoice_inherit &&
+ f->ipAddressChoice->u.inherit != NULL)
+ return 1;
+ if (f->ipAddressChoice->u.inherit == NULL &&
+ (f->ipAddressChoice->u.inherit = ASN1_NULL_new()) == NULL)
+ return 0;
+ f->ipAddressChoice->type = IPAddressChoice_inherit;
+ return 1;
+}
+
+/*
+ * Construct an IPAddressOrRange sequence, or return an existing one.
+ */
+static IPAddressOrRanges *make_prefix_or_range(IPAddrBlocks *addr,
+ const unsigned afi,
+ const unsigned *safi)
+{
+ IPAddressFamily *f = make_IPAddressFamily(addr, afi, safi);
+ IPAddressOrRanges *aors = NULL;
+
+ if (f == NULL ||
+ f->ipAddressChoice == NULL ||
+ (f->ipAddressChoice->type == IPAddressChoice_inherit &&
+ f->ipAddressChoice->u.inherit != NULL))
+ return NULL;
+ if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges)
+ aors = f->ipAddressChoice->u.addressesOrRanges;
+ if (aors != NULL)
+ return aors;
+ if ((aors = sk_IPAddressOrRange_new_null()) == NULL)
+ return NULL;
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ (void)sk_IPAddressOrRange_set_cmp_func(aors, v4IPAddressOrRange_cmp);
+ break;
+ case IANA_AFI_IPV6:
+ (void)sk_IPAddressOrRange_set_cmp_func(aors, v6IPAddressOrRange_cmp);
+ break;
+ }
+ f->ipAddressChoice->type = IPAddressChoice_addressesOrRanges;
+ f->ipAddressChoice->u.addressesOrRanges = aors;
+ return aors;
+}
+
+/*
+ * Add a prefix.
+ */
+int X509v3_addr_add_prefix(IPAddrBlocks *addr,
+ const unsigned afi,
+ const unsigned *safi,
+ unsigned char *a, const int prefixlen)
+{
+ IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
+ IPAddressOrRange *aor;
+ if (aors == NULL || !make_addressPrefix(&aor, a, prefixlen))
+ return 0;
+ if (sk_IPAddressOrRange_push(aors, aor))
+ return 1;
+ IPAddressOrRange_free(aor);
+ return 0;
+}
+
+/*
+ * Add a range.
+ */
+int X509v3_addr_add_range(IPAddrBlocks *addr,
+ const unsigned afi,
+ const unsigned *safi,
+ unsigned char *min, unsigned char *max)
+{
+ IPAddressOrRanges *aors = make_prefix_or_range(addr, afi, safi);
+ IPAddressOrRange *aor;
+ int length = length_from_afi(afi);
+ if (aors == NULL)
+ return 0;
+ if (!make_addressRange(&aor, min, max, length))
+ return 0;
+ if (sk_IPAddressOrRange_push(aors, aor))
+ return 1;
+ IPAddressOrRange_free(aor);
+ return 0;
+}
+
+/*
+ * Extract min and max values from an IPAddressOrRange.
+ */
+static int extract_min_max(IPAddressOrRange *aor,
+ unsigned char *min, unsigned char *max, int length)
+{
+ if (aor == NULL || min == NULL || max == NULL)
+ return 0;
+ switch (aor->type) {
+ case IPAddressOrRange_addressPrefix:
+ return (addr_expand(min, aor->u.addressPrefix, length, 0x00) &&
+ addr_expand(max, aor->u.addressPrefix, length, 0xFF));
+ case IPAddressOrRange_addressRange:
+ return (addr_expand(min, aor->u.addressRange->min, length, 0x00) &&
+ addr_expand(max, aor->u.addressRange->max, length, 0xFF));
+ }
+ return 0;
+}
+
+/*
+ * Public wrapper for extract_min_max().
+ */
+int X509v3_addr_get_range(IPAddressOrRange *aor,
+ const unsigned afi,
+ unsigned char *min,
+ unsigned char *max, const int length)
+{
+ int afi_length = length_from_afi(afi);
+ if (aor == NULL || min == NULL || max == NULL ||
+ afi_length == 0 || length < afi_length ||
+ (aor->type != IPAddressOrRange_addressPrefix &&
+ aor->type != IPAddressOrRange_addressRange) ||
+ !extract_min_max(aor, min, max, afi_length))
+ return 0;
+
+ return afi_length;
+}
+
+/*
+ * Sort comparison function for a sequence of IPAddressFamily.
+ *
+ * The last paragraph of RFC 3779 2.2.3.3 is slightly ambiguous about
+ * the ordering: I can read it as meaning that IPv6 without a SAFI
+ * comes before IPv4 with a SAFI, which seems pretty weird. The
+ * examples in appendix B suggest that the author intended the
+ * null-SAFI rule to apply only within a single AFI, which is what I
+ * would have expected and is what the following code implements.
+ */
+static int IPAddressFamily_cmp(const IPAddressFamily *const *a_,
+ const IPAddressFamily *const *b_)
+{
+ const ASN1_OCTET_STRING *a = (*a_)->addressFamily;
+ const ASN1_OCTET_STRING *b = (*b_)->addressFamily;
+ int len = ((a->length <= b->length) ? a->length : b->length);
+ int cmp = memcmp(a->data, b->data, len);
+ return cmp ? cmp : a->length - b->length;
+}
+
+/*
+ * Check whether an IPAddrBLocks is in canonical form.
+ */
+int X509v3_addr_is_canonical(IPAddrBlocks *addr)
+{
+ unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+ unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
+ IPAddressOrRanges *aors;
+ int i, j, k;
+
+ /*
+ * Empty extension is canonical.
+ */
+ if (addr == NULL)
+ return 1;
+
+ /*
+ * Check whether the top-level list is in order.
+ */
+ for (i = 0; i < sk_IPAddressFamily_num(addr) - 1; i++) {
+ const IPAddressFamily *a = sk_IPAddressFamily_value(addr, i);
+ const IPAddressFamily *b = sk_IPAddressFamily_value(addr, i + 1);
+ if (IPAddressFamily_cmp(&a, &b) >= 0)
+ return 0;
+ }
+
+ /*
+ * Top level's ok, now check each address family.
+ */
+ for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+ IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+ int length = length_from_afi(X509v3_addr_get_afi(f));
+
+ /*
+ * Inheritance is canonical. Anything other than inheritance or
+ * a SEQUENCE OF IPAddressOrRange is an ASN.1 error or something.
+ */
+ if (f == NULL || f->ipAddressChoice == NULL)
+ return 0;
+ switch (f->ipAddressChoice->type) {
+ case IPAddressChoice_inherit:
+ continue;
+ case IPAddressChoice_addressesOrRanges:
+ break;
+ default:
+ return 0;
+ }
+
+ /*
+ * It's an IPAddressOrRanges sequence, check it.
+ */
+ aors = f->ipAddressChoice->u.addressesOrRanges;
+ if (sk_IPAddressOrRange_num(aors) == 0)
+ return 0;
+ for (j = 0; j < sk_IPAddressOrRange_num(aors) - 1; j++) {
+ IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+ IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, j + 1);
+
+ if (!extract_min_max(a, a_min, a_max, length) ||
+ !extract_min_max(b, b_min, b_max, length))
+ return 0;
+
+ /*
+ * Punt misordered list, overlapping start, or inverted range.
+ */
+ if (memcmp(a_min, b_min, length) >= 0 ||
+ memcmp(a_min, a_max, length) > 0 ||
+ memcmp(b_min, b_max, length) > 0)
+ return 0;
+
+ /*
+ * Punt if adjacent or overlapping. Check for adjacency by
+ * subtracting one from b_min first.
+ */
+ for (k = length - 1; k >= 0 && b_min[k]-- == 0x00; k--) ;
+ if (memcmp(a_max, b_min, length) >= 0)
+ return 0;
+
+ /*
+ * Check for range that should be expressed as a prefix.
+ */
+ if (a->type == IPAddressOrRange_addressRange &&
+ range_should_be_prefix(a_min, a_max, length) >= 0)
+ return 0;
+ }
+
+ /*
+ * Check range to see if it's inverted or should be a
+ * prefix.
+ */
+ j = sk_IPAddressOrRange_num(aors) - 1;
+ {
+ IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+ if (a != NULL && a->type == IPAddressOrRange_addressRange) {
+ if (!extract_min_max(a, a_min, a_max, length))
+ return 0;
+ if (memcmp(a_min, a_max, length) > 0 ||
+ range_should_be_prefix(a_min, a_max, length) >= 0)
+ return 0;
+ }
+ }
+ }
+
+ /*
+ * If we made it through all that, we're happy.
+ */
+ return 1;
+}
+
+/*
+ * Whack an IPAddressOrRanges into canonical form.
+ */
+static int IPAddressOrRanges_canonize(IPAddressOrRanges *aors,
+ const unsigned afi)
+{
+ int i, j, length = length_from_afi(afi);
+
+ /*
+ * Sort the IPAddressOrRanges sequence.
+ */
+ sk_IPAddressOrRange_sort(aors);
+
+ /*
+ * Clean up representation issues, punt on duplicates or overlaps.
+ */
+ for (i = 0; i < sk_IPAddressOrRange_num(aors) - 1; i++) {
+ IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, i);
+ IPAddressOrRange *b = sk_IPAddressOrRange_value(aors, i + 1);
+ unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+ unsigned char b_min[ADDR_RAW_BUF_LEN], b_max[ADDR_RAW_BUF_LEN];
+
+ if (!extract_min_max(a, a_min, a_max, length) ||
+ !extract_min_max(b, b_min, b_max, length))
+ return 0;
+
+ /*
+ * Punt inverted ranges.
+ */
+ if (memcmp(a_min, a_max, length) > 0 ||
+ memcmp(b_min, b_max, length) > 0)
+ return 0;
+
+ /*
+ * Punt overlaps.
+ */
+ if (memcmp(a_max, b_min, length) >= 0)
+ return 0;
+
+ /*
+ * Merge if a and b are adjacent. We check for
+ * adjacency by subtracting one from b_min first.
+ */
+ for (j = length - 1; j >= 0 && b_min[j]-- == 0x00; j--) ;
+ if (memcmp(a_max, b_min, length) == 0) {
+ IPAddressOrRange *merged;
+ if (!make_addressRange(&merged, a_min, b_max, length))
+ return 0;
+ (void)sk_IPAddressOrRange_set(aors, i, merged);
+ (void)sk_IPAddressOrRange_delete(aors, i + 1);
+ IPAddressOrRange_free(a);
+ IPAddressOrRange_free(b);
+ --i;
+ continue;
+ }
+ }
+
+ /*
+ * Check for inverted final range.
+ */
+ j = sk_IPAddressOrRange_num(aors) - 1;
+ {
+ IPAddressOrRange *a = sk_IPAddressOrRange_value(aors, j);
+ if (a != NULL && a->type == IPAddressOrRange_addressRange) {
+ unsigned char a_min[ADDR_RAW_BUF_LEN], a_max[ADDR_RAW_BUF_LEN];
+ if (!extract_min_max(a, a_min, a_max, length))
+ return 0;
+ if (memcmp(a_min, a_max, length) > 0)
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Whack an IPAddrBlocks extension into canonical form.
+ */
+int X509v3_addr_canonize(IPAddrBlocks *addr)
+{
+ int i;
+ for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+ IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+ if (f->ipAddressChoice->type == IPAddressChoice_addressesOrRanges &&
+ !IPAddressOrRanges_canonize(f->ipAddressChoice->
+ u.addressesOrRanges,
+ X509v3_addr_get_afi(f)))
+ return 0;
+ }
+ (void)sk_IPAddressFamily_set_cmp_func(addr, IPAddressFamily_cmp);
+ sk_IPAddressFamily_sort(addr);
+ if (!ossl_assert(X509v3_addr_is_canonical(addr)))
+ return 0;
+ return 1;
+}
+
+/*
+ * v2i handler for the IPAddrBlocks extension.
+ */
+static void *v2i_IPAddrBlocks(const struct v3_ext_method *method,
+ struct v3_ext_ctx *ctx,
+ STACK_OF(CONF_VALUE) *values)
+{
+ static const char v4addr_chars[] = "0123456789.";
+ static const char v6addr_chars[] = "0123456789.:abcdefABCDEF";
+ IPAddrBlocks *addr = NULL;
+ char *s = NULL, *t;
+ int i;
+
+ if ((addr = sk_IPAddressFamily_new(IPAddressFamily_cmp)) == NULL) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
+ CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
+ unsigned char min[ADDR_RAW_BUF_LEN], max[ADDR_RAW_BUF_LEN];
+ unsigned afi, *safi = NULL, safi_;
+ const char *addr_chars = NULL;
+ int prefixlen, i1, i2, delim, length;
+
+ if (!name_cmp(val->name, "IPv4")) {
+ afi = IANA_AFI_IPV4;
+ } else if (!name_cmp(val->name, "IPv6")) {
+ afi = IANA_AFI_IPV6;
+ } else if (!name_cmp(val->name, "IPv4-SAFI")) {
+ afi = IANA_AFI_IPV4;
+ safi = &safi_;
+ } else if (!name_cmp(val->name, "IPv6-SAFI")) {
+ afi = IANA_AFI_IPV6;
+ safi = &safi_;
+ } else {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_EXTENSION_NAME_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+
+ switch (afi) {
+ case IANA_AFI_IPV4:
+ addr_chars = v4addr_chars;
+ break;
+ case IANA_AFI_IPV6:
+ addr_chars = v6addr_chars;
+ break;
+ }
+
+ length = length_from_afi(afi);
+
+ /*
+ * Handle SAFI, if any, and OPENSSL_strdup() so we can null-terminate
+ * the other input values.
+ */
+ if (safi != NULL) {
+ *safi = strtoul(val->value, &t, 0);
+ t += strspn(t, " \t");
+ if (*safi > 0xFF || *t++ != ':') {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_SAFI);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ t += strspn(t, " \t");
+ s = OPENSSL_strdup(t);
+ } else {
+ s = OPENSSL_strdup(val->value);
+ }
+ if (s == NULL) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ /*
+ * Check for inheritance. Not worth additional complexity to
+ * optimize this (seldom-used) case.
+ */
+ if (strcmp(s, "inherit") == 0) {
+ if (!X509v3_addr_add_inherit(addr, afi, safi)) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_INVALID_INHERITANCE);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ OPENSSL_free(s);
+ s = NULL;
+ continue;
+ }
+
+ i1 = strspn(s, addr_chars);
+ i2 = i1 + strspn(s + i1, " \t");
+ delim = s[i2++];
+ s[i1] = '\0';
+
+ if (a2i_ipadd(min, s) != length) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, X509V3_R_INVALID_IPADDRESS);
+ X509V3_conf_err(val);
+ goto err;
+ }
+
+ switch (delim) {
+ case '/':
+ prefixlen = (int)strtoul(s + i2, &t, 10);
+ if (t == s + i2 || *t != '\0') {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ if (!X509v3_addr_add_prefix(addr, afi, safi, min, prefixlen)) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ break;
+ case '-':
+ i1 = i2 + strspn(s + i2, " \t");
+ i2 = i1 + strspn(s + i1, addr_chars);
+ if (i1 == i2 || s[i2] != '\0') {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ if (a2i_ipadd(max, s + i1) != length) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_INVALID_IPADDRESS);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ if (memcmp(min, max, length_from_afi(afi)) > 0) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ if (!X509v3_addr_add_range(addr, afi, safi, min, max)) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ break;
+ case '\0':
+ if (!X509v3_addr_add_prefix(addr, afi, safi, min, length * 8)) {
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ break;
+ default:
+ X509V3err(X509V3_F_V2I_IPADDRBLOCKS,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+
+ OPENSSL_free(s);
+ s = NULL;
+ }
+
+ /*
+ * Canonize the result, then we're done.
+ */
+ if (!X509v3_addr_canonize(addr))
+ goto err;
+ return addr;
+
+ err:
+ OPENSSL_free(s);
+ sk_IPAddressFamily_pop_free(addr, IPAddressFamily_free);
+ return NULL;
+}
+
+/*
+ * OpenSSL dispatch
+ */
+const X509V3_EXT_METHOD v3_addr = {
+ NID_sbgp_ipAddrBlock, /* nid */
+ 0, /* flags */
+ ASN1_ITEM_ref(IPAddrBlocks), /* template */
+ 0, 0, 0, 0, /* old functions, ignored */
+ 0, /* i2s */
+ 0, /* s2i */
+ 0, /* i2v */
+ v2i_IPAddrBlocks, /* v2i */
+ i2r_IPAddrBlocks, /* i2r */
+ 0, /* r2i */
+ NULL /* extension-specific data */
+};
+
+/*
+ * Figure out whether extension sues inheritance.
+ */
+int X509v3_addr_inherits(IPAddrBlocks *addr)
+{
+ int i;
+ if (addr == NULL)
+ return 0;
+ for (i = 0; i < sk_IPAddressFamily_num(addr); i++) {
+ IPAddressFamily *f = sk_IPAddressFamily_value(addr, i);
+ if (f->ipAddressChoice->type == IPAddressChoice_inherit)
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Figure out whether parent contains child.
+ */
+static int addr_contains(IPAddressOrRanges *parent,
+ IPAddressOrRanges *child, int length)
+{
+ unsigned char p_min[ADDR_RAW_BUF_LEN], p_max[ADDR_RAW_BUF_LEN];
+ unsigned char c_min[ADDR_RAW_BUF_LEN], c_max[ADDR_RAW_BUF_LEN];
+ int p, c;
+
+ if (child == NULL || parent == child)
+ return 1;
+ if (parent == NULL)
+ return 0;
+
+ p = 0;
+ for (c = 0; c < sk_IPAddressOrRange_num(child); c++) {
+ if (!extract_min_max(sk_IPAddressOrRange_value(child, c),
+ c_min, c_max, length))
+ return -1;
+ for (;; p++) {
+ if (p >= sk_IPAddressOrRange_num(parent))
+ return 0;
+ if (!extract_min_max(sk_IPAddressOrRange_value(parent, p),
+ p_min, p_max, length))
+ return 0;
+ if (memcmp(p_max, c_max, length) < 0)
+ continue;
+ if (memcmp(p_min, c_min, length) > 0)
+ return 0;
+ break;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Test whether a is a subset of b.
+ */
+int X509v3_addr_subset(IPAddrBlocks *a, IPAddrBlocks *b)
+{
+ int i;
+ if (a == NULL || a == b)
+ return 1;
+ if (b == NULL || X509v3_addr_inherits(a) || X509v3_addr_inherits(b))
+ return 0;
+ (void)sk_IPAddressFamily_set_cmp_func(b, IPAddressFamily_cmp);
+ for (i = 0; i < sk_IPAddressFamily_num(a); i++) {
+ IPAddressFamily *fa = sk_IPAddressFamily_value(a, i);
+ int j = sk_IPAddressFamily_find(b, fa);
+ IPAddressFamily *fb;
+ fb = sk_IPAddressFamily_value(b, j);
+ if (fb == NULL)
+ return 0;
+ if (!addr_contains(fb->ipAddressChoice->u.addressesOrRanges,
+ fa->ipAddressChoice->u.addressesOrRanges,
+ length_from_afi(X509v3_addr_get_afi(fb))))
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Validation error handling via callback.
+ */
+#define validation_err(_err_) \
+ do { \
+ if (ctx != NULL) { \
+ ctx->error = _err_; \
+ ctx->error_depth = i; \
+ ctx->current_cert = x; \
+ ret = ctx->verify_cb(0, ctx); \
+ } else { \
+ ret = 0; \
+ } \
+ if (!ret) \
+ goto done; \
+ } while (0)
+
+/*
+ * Core code for RFC 3779 2.3 path validation.
+ *
+ * Returns 1 for success, 0 on error.
+ *
+ * When returning 0, ctx->error MUST be set to an appropriate value other than
+ * X509_V_OK.
+ */
+static int addr_validate_path_internal(X509_STORE_CTX *ctx,
+ STACK_OF(X509) *chain,
+ IPAddrBlocks *ext)
+{
+ IPAddrBlocks *child = NULL;
+ int i, j, ret = 1;
+ X509 *x;
+
+ if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
+ || !ossl_assert(ctx != NULL || ext != NULL)
+ || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
+ if (ctx != NULL)
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+
+ /*
+ * Figure out where to start. If we don't have an extension to
+ * check, we're done. Otherwise, check canonical form and
+ * set up for walking up the chain.
+ */
+ if (ext != NULL) {
+ i = -1;
+ x = NULL;
+ } else {
+ i = 0;
+ x = sk_X509_value(chain, i);
+ if ((ext = x->rfc3779_addr) == NULL)
+ goto done;
+ }
+ if (!X509v3_addr_is_canonical(ext))
+ validation_err(X509_V_ERR_INVALID_EXTENSION);
+ (void)sk_IPAddressFamily_set_cmp_func(ext, IPAddressFamily_cmp);
+ if ((child = sk_IPAddressFamily_dup(ext)) == NULL) {
+ X509V3err(X509V3_F_ADDR_VALIDATE_PATH_INTERNAL,
+ ERR_R_MALLOC_FAILURE);
+ if (ctx != NULL)
+ ctx->error = X509_V_ERR_OUT_OF_MEM;
+ ret = 0;
+ goto done;
+ }
+
+ /*
+ * Now walk up the chain. No cert may list resources that its
+ * parent doesn't list.
+ */
+ for (i++; i < sk_X509_num(chain); i++) {
+ x = sk_X509_value(chain, i);
+ if (!X509v3_addr_is_canonical(x->rfc3779_addr))
+ validation_err(X509_V_ERR_INVALID_EXTENSION);
+ if (x->rfc3779_addr == NULL) {
+ for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
+ IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
+ if (fc->ipAddressChoice->type != IPAddressChoice_inherit) {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ break;
+ }
+ }
+ continue;
+ }
+ (void)sk_IPAddressFamily_set_cmp_func(x->rfc3779_addr,
+ IPAddressFamily_cmp);
+ for (j = 0; j < sk_IPAddressFamily_num(child); j++) {
+ IPAddressFamily *fc = sk_IPAddressFamily_value(child, j);
+ int k = sk_IPAddressFamily_find(x->rfc3779_addr, fc);
+ IPAddressFamily *fp =
+ sk_IPAddressFamily_value(x->rfc3779_addr, k);
+ if (fp == NULL) {
+ if (fc->ipAddressChoice->type ==
+ IPAddressChoice_addressesOrRanges) {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ break;
+ }
+ continue;
+ }
+ if (fp->ipAddressChoice->type ==
+ IPAddressChoice_addressesOrRanges) {
+ if (fc->ipAddressChoice->type == IPAddressChoice_inherit
+ || addr_contains(fp->ipAddressChoice->u.addressesOrRanges,
+ fc->ipAddressChoice->u.addressesOrRanges,
+ length_from_afi(X509v3_addr_get_afi(fc))))
+ sk_IPAddressFamily_set(child, j, fp);
+ else
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ }
+ }
+ }
+
+ /*
+ * Trust anchor can't inherit.
+ */
+ if (x->rfc3779_addr != NULL) {
+ for (j = 0; j < sk_IPAddressFamily_num(x->rfc3779_addr); j++) {
+ IPAddressFamily *fp =
+ sk_IPAddressFamily_value(x->rfc3779_addr, j);
+ if (fp->ipAddressChoice->type == IPAddressChoice_inherit
+ && sk_IPAddressFamily_find(child, fp) >= 0)
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ }
+ }
+
+ done:
+ sk_IPAddressFamily_free(child);
+ return ret;
+}
+
+#undef validation_err
+
+/*
+ * RFC 3779 2.3 path validation -- called from X509_verify_cert().
+ */
+int X509v3_addr_validate_path(X509_STORE_CTX *ctx)
+{
+ if (ctx->chain == NULL
+ || sk_X509_num(ctx->chain) == 0
+ || ctx->verify_cb == NULL) {
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+ return addr_validate_path_internal(ctx, ctx->chain, NULL);
+}
+
+/*
+ * RFC 3779 2.3 path validation of an extension.
+ * Test whether chain covers extension.
+ */
+int X509v3_addr_validate_resource_set(STACK_OF(X509) *chain,
+ IPAddrBlocks *ext, int allow_inheritance)
+{
+ if (ext == NULL)
+ return 1;
+ if (chain == NULL || sk_X509_num(chain) == 0)
+ return 0;
+ if (!allow_inheritance && X509v3_addr_inherits(ext))
+ return 0;
+ return addr_validate_path_internal(NULL, chain, ext);
+}
+
+#endif /* OPENSSL_NO_RFC3779 */
--- /dev/null
+/*
+ * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * Implementation of RFC 3779 section 3.2.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "internal/cryptlib.h"
+#include <openssl/conf.h>
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/x509v3.h>
+#include <openssl/x509.h>
+#include "crypto/x509.h"
+#include <openssl/bn.h>
+#include "ext_dat.h"
+
+#ifndef OPENSSL_NO_RFC3779
+
+/*
+ * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
+ */
+
+ASN1_SEQUENCE(ASRange) = {
+ ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
+ ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
+} ASN1_SEQUENCE_END(ASRange)
+
+ASN1_CHOICE(ASIdOrRange) = {
+ ASN1_SIMPLE(ASIdOrRange, u.id, ASN1_INTEGER),
+ ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
+} ASN1_CHOICE_END(ASIdOrRange)
+
+ASN1_CHOICE(ASIdentifierChoice) = {
+ ASN1_SIMPLE(ASIdentifierChoice, u.inherit, ASN1_NULL),
+ ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
+} ASN1_CHOICE_END(ASIdentifierChoice)
+
+ASN1_SEQUENCE(ASIdentifiers) = {
+ ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
+ ASN1_EXP_OPT(ASIdentifiers, rdi, ASIdentifierChoice, 1)
+} ASN1_SEQUENCE_END(ASIdentifiers)
+
+IMPLEMENT_ASN1_FUNCTIONS(ASRange)
+IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
+IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
+IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)
+
+/*
+ * i2r method for an ASIdentifierChoice.
+ */
+static int i2r_ASIdentifierChoice(BIO *out,
+ ASIdentifierChoice *choice,
+ int indent, const char *msg)
+{
+ int i;
+ char *s;
+ if (choice == NULL)
+ return 1;
+ BIO_printf(out, "%*s%s:\n", indent, "", msg);
+ switch (choice->type) {
+ case ASIdentifierChoice_inherit:
+ BIO_printf(out, "%*sinherit\n", indent + 2, "");
+ break;
+ case ASIdentifierChoice_asIdsOrRanges:
+ for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
+ ASIdOrRange *aor =
+ sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
+ switch (aor->type) {
+ case ASIdOrRange_id:
+ if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
+ return 0;
+ BIO_printf(out, "%*s%s\n", indent + 2, "", s);
+ OPENSSL_free(s);
+ break;
+ case ASIdOrRange_range:
+ if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
+ return 0;
+ BIO_printf(out, "%*s%s-", indent + 2, "", s);
+ OPENSSL_free(s);
+ if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
+ return 0;
+ BIO_printf(out, "%s\n", s);
+ OPENSSL_free(s);
+ break;
+ default:
+ return 0;
+ }
+ }
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * i2r method for an ASIdentifier extension.
+ */
+static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method,
+ void *ext, BIO *out, int indent)
+{
+ ASIdentifiers *asid = ext;
+ return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
+ "Autonomous System Numbers") &&
+ i2r_ASIdentifierChoice(out, asid->rdi, indent,
+ "Routing Domain Identifiers"));
+}
+
+/*
+ * Sort comparison function for a sequence of ASIdOrRange elements.
+ */
+static int ASIdOrRange_cmp(const ASIdOrRange *const *a_,
+ const ASIdOrRange *const *b_)
+{
+ const ASIdOrRange *a = *a_, *b = *b_;
+
+ assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
+ (a->type == ASIdOrRange_range && a->u.range != NULL &&
+ a->u.range->min != NULL && a->u.range->max != NULL));
+
+ assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
+ (b->type == ASIdOrRange_range && b->u.range != NULL &&
+ b->u.range->min != NULL && b->u.range->max != NULL));
+
+ if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
+ return ASN1_INTEGER_cmp(a->u.id, b->u.id);
+
+ if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
+ int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
+ return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max,
+ b->u.range->max);
+ }
+
+ if (a->type == ASIdOrRange_id)
+ return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
+ else
+ return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
+}
+
+/*
+ * Add an inherit element.
+ */
+int X509v3_asid_add_inherit(ASIdentifiers *asid, int which)
+{
+ ASIdentifierChoice **choice;
+ if (asid == NULL)
+ return 0;
+ switch (which) {
+ case V3_ASID_ASNUM:
+ choice = &asid->asnum;
+ break;
+ case V3_ASID_RDI:
+ choice = &asid->rdi;
+ break;
+ default:
+ return 0;
+ }
+ if (*choice == NULL) {
+ if ((*choice = ASIdentifierChoice_new()) == NULL)
+ return 0;
+ if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL)
+ return 0;
+ (*choice)->type = ASIdentifierChoice_inherit;
+ }
+ return (*choice)->type == ASIdentifierChoice_inherit;
+}
+
+/*
+ * Add an ID or range to an ASIdentifierChoice.
+ */
+int X509v3_asid_add_id_or_range(ASIdentifiers *asid,
+ int which, ASN1_INTEGER *min, ASN1_INTEGER *max)
+{
+ ASIdentifierChoice **choice;
+ ASIdOrRange *aor;
+ if (asid == NULL)
+ return 0;
+ switch (which) {
+ case V3_ASID_ASNUM:
+ choice = &asid->asnum;
+ break;
+ case V3_ASID_RDI:
+ choice = &asid->rdi;
+ break;
+ default:
+ return 0;
+ }
+ if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit)
+ return 0;
+ if (*choice == NULL) {
+ if ((*choice = ASIdentifierChoice_new()) == NULL)
+ return 0;
+ (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
+ if ((*choice)->u.asIdsOrRanges == NULL)
+ return 0;
+ (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
+ }
+ if ((aor = ASIdOrRange_new()) == NULL)
+ return 0;
+ if (max == NULL) {
+ aor->type = ASIdOrRange_id;
+ aor->u.id = min;
+ } else {
+ aor->type = ASIdOrRange_range;
+ if ((aor->u.range = ASRange_new()) == NULL)
+ goto err;
+ ASN1_INTEGER_free(aor->u.range->min);
+ aor->u.range->min = min;
+ ASN1_INTEGER_free(aor->u.range->max);
+ aor->u.range->max = max;
+ }
+ if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
+ goto err;
+ return 1;
+
+ err:
+ ASIdOrRange_free(aor);
+ return 0;
+}
+
+/*
+ * Extract min and max values from an ASIdOrRange.
+ */
+static int extract_min_max(ASIdOrRange *aor,
+ ASN1_INTEGER **min, ASN1_INTEGER **max)
+{
+ if (!ossl_assert(aor != NULL))
+ return 0;
+ switch (aor->type) {
+ case ASIdOrRange_id:
+ *min = aor->u.id;
+ *max = aor->u.id;
+ return 1;
+ case ASIdOrRange_range:
+ *min = aor->u.range->min;
+ *max = aor->u.range->max;
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+ * Check whether an ASIdentifierChoice is in canonical form.
+ */
+static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
+{
+ ASN1_INTEGER *a_max_plus_one = NULL;
+ ASN1_INTEGER *orig;
+ BIGNUM *bn = NULL;
+ int i, ret = 0;
+
+ /*
+ * Empty element or inheritance is canonical.
+ */
+ if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
+ return 1;
+
+ /*
+ * If not a list, or if empty list, it's broken.
+ */
+ if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
+ sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
+ return 0;
+
+ /*
+ * It's a list, check it.
+ */
+ for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
+ ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
+ ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
+ ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
+ NULL;
+
+ if (!extract_min_max(a, &a_min, &a_max)
+ || !extract_min_max(b, &b_min, &b_max))
+ goto done;
+
+ /*
+ * Punt misordered list, overlapping start, or inverted range.
+ */
+ if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
+ ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
+ ASN1_INTEGER_cmp(b_min, b_max) > 0)
+ goto done;
+
+ /*
+ * Calculate a_max + 1 to check for adjacency.
+ */
+ if ((bn == NULL && (bn = BN_new()) == NULL) ||
+ ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
+ !BN_add_word(bn, 1)) {
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
+ ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ if ((a_max_plus_one =
+ BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
+ a_max_plus_one = orig;
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
+ ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ /*
+ * Punt if adjacent or overlapping.
+ */
+ if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
+ goto done;
+ }
+
+ /*
+ * Check for inverted range.
+ */
+ i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
+ {
+ ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
+ ASN1_INTEGER *a_min, *a_max;
+ if (a != NULL && a->type == ASIdOrRange_range) {
+ if (!extract_min_max(a, &a_min, &a_max)
+ || ASN1_INTEGER_cmp(a_min, a_max) > 0)
+ goto done;
+ }
+ }
+
+ ret = 1;
+
+ done:
+ ASN1_INTEGER_free(a_max_plus_one);
+ BN_free(bn);
+ return ret;
+}
+
+/*
+ * Check whether an ASIdentifier extension is in canonical form.
+ */
+int X509v3_asid_is_canonical(ASIdentifiers *asid)
+{
+ return (asid == NULL ||
+ (ASIdentifierChoice_is_canonical(asid->asnum) &&
+ ASIdentifierChoice_is_canonical(asid->rdi)));
+}
+
+/*
+ * Whack an ASIdentifierChoice into canonical form.
+ */
+static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
+{
+ ASN1_INTEGER *a_max_plus_one = NULL;
+ ASN1_INTEGER *orig;
+ BIGNUM *bn = NULL;
+ int i, ret = 0;
+
+ /*
+ * Nothing to do for empty element or inheritance.
+ */
+ if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
+ return 1;
+
+ /*
+ * If not a list, or if empty list, it's broken.
+ */
+ if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
+ sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) {
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ return 0;
+ }
+
+ /*
+ * We have a non-empty list. Sort it.
+ */
+ sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);
+
+ /*
+ * Now check for errors and suboptimal encoding, rejecting the
+ * former and fixing the latter.
+ */
+ for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
+ ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
+ ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
+ ASN1_INTEGER *a_min = NULL, *a_max = NULL, *b_min = NULL, *b_max =
+ NULL;
+
+ if (!extract_min_max(a, &a_min, &a_max)
+ || !extract_min_max(b, &b_min, &b_max))
+ goto done;
+
+ /*
+ * Make sure we're properly sorted (paranoia).
+ */
+ if (!ossl_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0))
+ goto done;
+
+ /*
+ * Punt inverted ranges.
+ */
+ if (ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
+ ASN1_INTEGER_cmp(b_min, b_max) > 0)
+ goto done;
+
+ /*
+ * Check for overlaps.
+ */
+ if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ goto done;
+ }
+
+ /*
+ * Calculate a_max + 1 to check for adjacency.
+ */
+ if ((bn == NULL && (bn = BN_new()) == NULL) ||
+ ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
+ !BN_add_word(bn, 1)) {
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
+ ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ if ((a_max_plus_one =
+ BN_to_ASN1_INTEGER(bn, orig = a_max_plus_one)) == NULL) {
+ a_max_plus_one = orig;
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
+ ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ /*
+ * If a and b are adjacent, merge them.
+ */
+ if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
+ ASRange *r;
+ switch (a->type) {
+ case ASIdOrRange_id:
+ if ((r = OPENSSL_malloc(sizeof(*r))) == NULL) {
+ X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
+ ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+ r->min = a_min;
+ r->max = b_max;
+ a->type = ASIdOrRange_range;
+ a->u.range = r;
+ break;
+ case ASIdOrRange_range:
+ ASN1_INTEGER_free(a->u.range->max);
+ a->u.range->max = b_max;
+ break;
+ }
+ switch (b->type) {
+ case ASIdOrRange_id:
+ b->u.id = NULL;
+ break;
+ case ASIdOrRange_range:
+ b->u.range->max = NULL;
+ break;
+ }
+ ASIdOrRange_free(b);
+ (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
+ i--;
+ continue;
+ }
+ }
+
+ /*
+ * Check for final inverted range.
+ */
+ i = sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1;
+ {
+ ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
+ ASN1_INTEGER *a_min, *a_max;
+ if (a != NULL && a->type == ASIdOrRange_range) {
+ if (!extract_min_max(a, &a_min, &a_max)
+ || ASN1_INTEGER_cmp(a_min, a_max) > 0)
+ goto done;
+ }
+ }
+
+ /* Paranoia */
+ if (!ossl_assert(ASIdentifierChoice_is_canonical(choice)))
+ goto done;
+
+ ret = 1;
+
+ done:
+ ASN1_INTEGER_free(a_max_plus_one);
+ BN_free(bn);
+ return ret;
+}
+
+/*
+ * Whack an ASIdentifier extension into canonical form.
+ */
+int X509v3_asid_canonize(ASIdentifiers *asid)
+{
+ return (asid == NULL ||
+ (ASIdentifierChoice_canonize(asid->asnum) &&
+ ASIdentifierChoice_canonize(asid->rdi)));
+}
+
+/*
+ * v2i method for an ASIdentifier extension.
+ */
+static void *v2i_ASIdentifiers(const struct v3_ext_method *method,
+ struct v3_ext_ctx *ctx,
+ STACK_OF(CONF_VALUE) *values)
+{
+ ASN1_INTEGER *min = NULL, *max = NULL;
+ ASIdentifiers *asid = NULL;
+ int i;
+
+ if ((asid = ASIdentifiers_new()) == NULL) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
+ CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
+ int i1 = 0, i2 = 0, i3 = 0, is_range = 0, which = 0;
+
+ /*
+ * Figure out whether this is an AS or an RDI.
+ */
+ if (!name_cmp(val->name, "AS")) {
+ which = V3_ASID_ASNUM;
+ } else if (!name_cmp(val->name, "RDI")) {
+ which = V3_ASID_RDI;
+ } else {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
+ X509V3_R_EXTENSION_NAME_ERROR);
+ X509V3_conf_err(val);
+ goto err;
+ }
+
+ /*
+ * Handle inheritance.
+ */
+ if (strcmp(val->value, "inherit") == 0) {
+ if (X509v3_asid_add_inherit(asid, which))
+ continue;
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
+ X509V3_R_INVALID_INHERITANCE);
+ X509V3_conf_err(val);
+ goto err;
+ }
+
+ /*
+ * Number, range, or mistake, pick it apart and figure out which.
+ */
+ i1 = strspn(val->value, "0123456789");
+ if (val->value[i1] == '\0') {
+ is_range = 0;
+ } else {
+ is_range = 1;
+ i2 = i1 + strspn(val->value + i1, " \t");
+ if (val->value[i2] != '-') {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
+ X509V3_R_INVALID_ASNUMBER);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ i2++;
+ i2 = i2 + strspn(val->value + i2, " \t");
+ i3 = i2 + strspn(val->value + i2, "0123456789");
+ if (val->value[i3] != '\0') {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
+ X509V3_R_INVALID_ASRANGE);
+ X509V3_conf_err(val);
+ goto err;
+ }
+ }
+
+ /*
+ * Syntax is ok, read and add it.
+ */
+ if (!is_range) {
+ if (!X509V3_get_value_int(val, &min)) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ } else {
+ char *s = OPENSSL_strdup(val->value);
+ if (s == NULL) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ s[i1] = '\0';
+ min = s2i_ASN1_INTEGER(NULL, s);
+ max = s2i_ASN1_INTEGER(NULL, s + i2);
+ OPENSSL_free(s);
+ if (min == NULL || max == NULL) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ if (ASN1_INTEGER_cmp(min, max) > 0) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS,
+ X509V3_R_EXTENSION_VALUE_ERROR);
+ goto err;
+ }
+ }
+ if (!X509v3_asid_add_id_or_range(asid, which, min, max)) {
+ X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ min = max = NULL;
+ }
+
+ /*
+ * Canonize the result, then we're done.
+ */
+ if (!X509v3_asid_canonize(asid))
+ goto err;
+ return asid;
+
+ err:
+ ASIdentifiers_free(asid);
+ ASN1_INTEGER_free(min);
+ ASN1_INTEGER_free(max);
+ return NULL;
+}
+
+/*
+ * OpenSSL dispatch.
+ */
+const X509V3_EXT_METHOD v3_asid = {
+ NID_sbgp_autonomousSysNum, /* nid */
+ 0, /* flags */
+ ASN1_ITEM_ref(ASIdentifiers), /* template */
+ 0, 0, 0, 0, /* old functions, ignored */
+ 0, /* i2s */
+ 0, /* s2i */
+ 0, /* i2v */
+ v2i_ASIdentifiers, /* v2i */
+ i2r_ASIdentifiers, /* i2r */
+ 0, /* r2i */
+ NULL /* extension-specific data */
+};
+
+/*
+ * Figure out whether extension uses inheritance.
+ */
+int X509v3_asid_inherits(ASIdentifiers *asid)
+{
+ return (asid != NULL &&
+ ((asid->asnum != NULL &&
+ asid->asnum->type == ASIdentifierChoice_inherit) ||
+ (asid->rdi != NULL &&
+ asid->rdi->type == ASIdentifierChoice_inherit)));
+}
+
+/*
+ * Figure out whether parent contains child.
+ */
+static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
+{
+ ASN1_INTEGER *p_min = NULL, *p_max = NULL, *c_min = NULL, *c_max = NULL;
+ int p, c;
+
+ if (child == NULL || parent == child)
+ return 1;
+ if (parent == NULL)
+ return 0;
+
+ p = 0;
+ for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
+ if (!extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max))
+ return 0;
+ for (;; p++) {
+ if (p >= sk_ASIdOrRange_num(parent))
+ return 0;
+ if (!extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min,
+ &p_max))
+ return 0;
+ if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
+ continue;
+ if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
+ return 0;
+ break;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Test whether a is a subset of b.
+ */
+int X509v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
+{
+ return (a == NULL ||
+ a == b ||
+ (b != NULL &&
+ !X509v3_asid_inherits(a) &&
+ !X509v3_asid_inherits(b) &&
+ asid_contains(b->asnum->u.asIdsOrRanges,
+ a->asnum->u.asIdsOrRanges) &&
+ asid_contains(b->rdi->u.asIdsOrRanges,
+ a->rdi->u.asIdsOrRanges)));
+}
+
+/*
+ * Validation error handling via callback.
+ */
+#define validation_err(_err_) \
+ do { \
+ if (ctx != NULL) { \
+ ctx->error = _err_; \
+ ctx->error_depth = i; \
+ ctx->current_cert = x; \
+ ret = ctx->verify_cb(0, ctx); \
+ } else { \
+ ret = 0; \
+ } \
+ if (!ret) \
+ goto done; \
+ } while (0)
+
+/*
+ * Core code for RFC 3779 3.3 path validation.
+ */
+static int asid_validate_path_internal(X509_STORE_CTX *ctx,
+ STACK_OF(X509) *chain,
+ ASIdentifiers *ext)
+{
+ ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
+ int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
+ X509 *x;
+
+ if (!ossl_assert(chain != NULL && sk_X509_num(chain) > 0)
+ || !ossl_assert(ctx != NULL || ext != NULL)
+ || !ossl_assert(ctx == NULL || ctx->verify_cb != NULL)) {
+ if (ctx != NULL)
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+
+
+ /*
+ * Figure out where to start. If we don't have an extension to
+ * check, we're done. Otherwise, check canonical form and
+ * set up for walking up the chain.
+ */
+ if (ext != NULL) {
+ i = -1;
+ x = NULL;
+ } else {
+ i = 0;
+ x = sk_X509_value(chain, i);
+ if ((ext = x->rfc3779_asid) == NULL)
+ goto done;
+ }
+ if (!X509v3_asid_is_canonical(ext))
+ validation_err(X509_V_ERR_INVALID_EXTENSION);
+ if (ext->asnum != NULL) {
+ switch (ext->asnum->type) {
+ case ASIdentifierChoice_inherit:
+ inherit_as = 1;
+ break;
+ case ASIdentifierChoice_asIdsOrRanges:
+ child_as = ext->asnum->u.asIdsOrRanges;
+ break;
+ }
+ }
+ if (ext->rdi != NULL) {
+ switch (ext->rdi->type) {
+ case ASIdentifierChoice_inherit:
+ inherit_rdi = 1;
+ break;
+ case ASIdentifierChoice_asIdsOrRanges:
+ child_rdi = ext->rdi->u.asIdsOrRanges;
+ break;
+ }
+ }
+
+ /*
+ * Now walk up the chain. Extensions must be in canonical form, no
+ * cert may list resources that its parent doesn't list.
+ */
+ for (i++; i < sk_X509_num(chain); i++) {
+ x = sk_X509_value(chain, i);
+ if (!ossl_assert(x != NULL)) {
+ if (ctx != NULL)
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+ if (x->rfc3779_asid == NULL) {
+ if (child_as != NULL || child_rdi != NULL)
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ continue;
+ }
+ if (!X509v3_asid_is_canonical(x->rfc3779_asid))
+ validation_err(X509_V_ERR_INVALID_EXTENSION);
+ if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ child_as = NULL;
+ inherit_as = 0;
+ }
+ if (x->rfc3779_asid->asnum != NULL &&
+ x->rfc3779_asid->asnum->type ==
+ ASIdentifierChoice_asIdsOrRanges) {
+ if (inherit_as
+ || asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges,
+ child_as)) {
+ child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
+ inherit_as = 0;
+ } else {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ }
+ }
+ if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ child_rdi = NULL;
+ inherit_rdi = 0;
+ }
+ if (x->rfc3779_asid->rdi != NULL &&
+ x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
+ if (inherit_rdi ||
+ asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges,
+ child_rdi)) {
+ child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
+ inherit_rdi = 0;
+ } else {
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ }
+ }
+ }
+
+ /*
+ * Trust anchor can't inherit.
+ */
+ if (!ossl_assert(x != NULL)) {
+ if (ctx != NULL)
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+ if (x->rfc3779_asid != NULL) {
+ if (x->rfc3779_asid->asnum != NULL &&
+ x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ if (x->rfc3779_asid->rdi != NULL &&
+ x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
+ validation_err(X509_V_ERR_UNNESTED_RESOURCE);
+ }
+
+ done:
+ return ret;
+}
+
+#undef validation_err
+
+/*
+ * RFC 3779 3.3 path validation -- called from X509_verify_cert().
+ */
+int X509v3_asid_validate_path(X509_STORE_CTX *ctx)
+{
+ if (ctx->chain == NULL
+ || sk_X509_num(ctx->chain) == 0
+ || ctx->verify_cb == NULL) {
+ ctx->error = X509_V_ERR_UNSPECIFIED;
+ return 0;
+ }
+ return asid_validate_path_internal(ctx, ctx->chain, NULL);
+}
+
+/*
+ * RFC 3779 3.3 path validation of an extension.
+ * Test whether chain covers extension.
+ */
+int X509v3_asid_validate_resource_set(STACK_OF(X509) *chain,
+ ASIdentifiers *ext, int allow_inheritance)
+{
+ if (ext == NULL)
+ return 1;
+ if (chain == NULL || sk_X509_num(chain) == 0)
+ return 0;
+ if (!allow_inheritance && X509v3_asid_inherits(ext))
+ return 0;
+ return asid_validate_path_internal(NULL, chain, ext);
+}
+
+#endif /* OPENSSL_NO_RFC3779 */
projects / openbsd / commitdiff